If r cannot equal 0, which of the following polar coordinate pairs represents the same point as the point with polar coordinates (r, theta) select all that apply (2 correct answers)
a. (-r, theta - 2π)
b. (-r, theta + 3π)
c. (r, theta + 2π)
d. (r, theta - π)
a. (-r, theta - 2π)
b. (-r, theta + 3π)